Cheap and efficient filter solution

[brinks]

Just wondering how you support/attach it to the tank, or does it just hang in place?

[Wasserpest]

If you can place it upside down, you can just set it on top of the substrate.

In my 36 bow front tank I partitioned off the back corner with some plastic strip, put a piece of foam there, and the pump is sitting on top of the foam.

Sometimes the power cable comes out on top of the pump. You can use a zip tie to tie it to the pump and direct it up if the pump is placed upside down.

Some pumps (like the AquaClear series) have rubber feet that you can use to stick the pump to the glass. In my experience they don't hold very well, after a while they harden and with the vibrations of the pump the will let go.